package me.zhengjie.base;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import lombok.extern.slf4j.Slf4j;
import me.zhengjie.annotation.DataPermission;
import me.zhengjie.annotation.Query;
import me.zhengjie.annotation.Scene;
import me.zhengjie.utils.SecurityUtils;
import me.zhengjie.utils.StringUtils;
import org.springframework.util.ReflectionUtils;

import java.lang.reflect.Field;
import java.util.*;

/**
 * @author Zheng Jie
 * @date 2019-6-4 14:59:48
 */
@Slf4j
public class QueryHelpMybatisPlus {

    // TODO DataPermission
    public static <R, Q> QueryWrapper<R> getPredicate(Q query) {
        QueryWrapper<R> queryWrapper = new QueryWrapper<>();
        if (query == null) {
            return queryWrapper;
        }

        // 数据权限验证
        DataPermission permission = query.getClass().getAnnotation(DataPermission.class);
        if(permission != null){
            // 获取数据权限
            List<Long> dataScopes = SecurityUtils.getCurrentUserDataScope();
            if(CollectionUtil.isNotEmpty(dataScopes)){
                // 过滤场景
                boolean ignoreScene = false;
                if(ArrayUtil.isNotEmpty(permission.ignoreScene())) {
                    boolean exits = query.getClass().isAnnotationPresent(Scene.class);
                    if(exits) {
                        for(Field field : query.getClass().getDeclaredFields()) {
                            Scene scene = field.getAnnotation(Scene.class);
                            if (scene != null) {
                                Object sceneValue = ReflectionUtils.getField(field, query);
                                if(Objects.nonNull(sceneValue)) {
                                    if(StringUtils.equalsAny(String.valueOf(sceneValue), permission.ignoreScene())) {
                                        ignoreScene = true;
                                        break;
                                    }
                                }
                            }
                        }
                    } else {
                       throw new RuntimeException("需要用 @Scene 注解标识场景字段值, 根据字段对应的值判断是否忽略");
                    }
                }
                if(!ignoreScene) {
                    if(StringUtils.isNotBlank(permission.joinName()) && StringUtils.isNotBlank(permission.fieldName())) {
                        //Join join = root.join(permission.joinName(), JoinType.LEFT);
                        //list.add(getExpression(permission.fieldName(),join, root).in(dataScopes));
                        
                        throw new RuntimeException("未实现");
                    } else if (StringUtils.isBlank(permission.joinName()) && StringUtils.isNotBlank(permission.fieldName())) {
                        //list.add(getExpression(permission.fieldName(),null, root).in(dataScopes));
                        queryWrapper.in(permission.fieldName(), dataScopes);
                    }
                }
            }
        }

        try {
            List<Field> fields = getAllFields(query.getClass(), new ArrayList<>());
            for (Field field : fields) {
                boolean accessible = field.isAccessible();
                field.setAccessible(true);
                Query q = field.getAnnotation(Query.class);
                if (q != null) {
                    String propName = q.propName();
                    String blurry = q.blurry();
                    String attributeName = StrUtil.isBlank(propName) ? field.getName() : propName;
                    attributeName = humpToUnderline(attributeName);
                    Class<?> fieldType = field.getType();
                    Object val = field.get(query);
                    if (ObjectUtil.isNull(val) || "".equals(val)) {
                        continue;
                    }
                    // 模糊多字段
                    if (ObjectUtil.isNotEmpty(blurry)) {
                        String[] blurrys = blurry.split(",");
                        //queryWrapper.or();
                        queryWrapper.and(wrapper -> {
                            for (String blurry1 : blurrys) {
                                String column = humpToUnderline(blurry1);
                                //if(i!=0){
                                wrapper.or();
                                //}
                                wrapper.like(column, val.toString());
                            }
                        });
                        continue;
                    }
                    String finalAttributeName = attributeName;
                    switch (q.type()) {
                        case EQUAL:
                            //queryWrapper.and(wrapper -> wrapper.eq(finalAttributeName, val));
                            queryWrapper.eq(attributeName, val);
                            break;
                        case GREATER_THAN:
                           queryWrapper.ge(finalAttributeName, val);
                            break;
                        case LESS_THAN:
                            queryWrapper.le(finalAttributeName, val);
                            break;
                        case LESS_THAN_NQ:
                           queryWrapper.lt(finalAttributeName, val);
                            break;
                        case INNER_LIKE:
                           queryWrapper.like(finalAttributeName, val);
                            break;
                        case LEFT_LIKE:
                           queryWrapper.likeLeft(finalAttributeName, val);
                            break;
                        case RIGHT_LIKE:
                           queryWrapper.likeRight(finalAttributeName, val);
                            break;
                        case IN:
                            if (CollUtil.isNotEmpty((Collection<Long>) val)) {
                               queryWrapper.in(finalAttributeName, (Collection<Long>) val);
                            }
                            break;
                        case NOT_IN:
                            if (CollUtil.isNotEmpty((Collection<Long>) val)) {
                                queryWrapper.notIn(finalAttributeName, (Collection<Long>) val);
                            }
                            break;
                        case NOT_EQUAL:
                           queryWrapper.ne(finalAttributeName, val);
                            break;
                        case NOT_NULL:
                            queryWrapper.isNotNull(finalAttributeName);
                            break;
                        case IS_NULL:
                            queryWrapper.isNull(finalAttributeName);
                            break;
                        case BETWEEN:
                            List<Object> between = new ArrayList<>((List<Object>) val);
                           queryWrapper.between(finalAttributeName, between.get(0), between.get(1));
                            break;
                        default:
                            break;
                    }
                }
                field.setAccessible(accessible);
            }
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }

        return queryWrapper;
    }

    public static List<Field> getAllFields(Class clazz, List<Field> fields) {
        if (clazz != null) {
            fields.addAll(Arrays.asList(clazz.getDeclaredFields()));
            getAllFields(clazz.getSuperclass(), fields);
        }
        return fields;
    }

    /***
     * 驼峰命名转为下划线命名
     *
     * @param para
     *        驼峰命名的字符串
     */

    public static String humpToUnderline(String para) {
        return StrUtil.toUnderlineCase(para);
    }

//    public static void main(String[] args) {
//        QueryWrapper<Paging> query = new QueryWrapper<Paging>();
//        //query.or();
//        query.or(wrapper -> wrapper.eq("store_id", 1).or().eq("store_id", 2));
//        //query.like("a",1);
//        //query.or();
//        //query.like("b",2);
//        //query.and(wrapper->wrapper.eq("c",1));
//        query.eq("1", 1);
//
//        System.out.println(query.getSqlSegment());
//    }
}
